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利用CSS Multi Background 提高网页视觉效果

CSS Multi Background 是CSS3中的一个新特性,它允许在一个元素中设置多个背景图像,每一个背景图像可以独立设置位置和大小,并且可以指定背景图像的叠放顺序。利用 CSS Multi Background 可以让我们更加灵活地实现网页的视觉效果,提升用户的体验。以下将从多个方面介绍如何使用 CSS Multi Background 提高网页视觉效果。

一、交错阴影的效果

交错阴影是指两张背景图像之间,设置一层半透明的多边形,产生一种阴影交错的效果。

.container {
  background-image: 
    url(images/background-1.png), 
    url(images/background-2.png);
  background-size: cover, auto;
  background-position: center, top;
}
.container:before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -50px;
  right: -50px;
  background: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0));
}

以上代码实现了两张背景图像的交错阴影效果。第一张背景图片居中显示,并且将第二张背景图片的大小设置为自适应。半透明的多边形通过 :before 伪元素创建,利用 linear-gradient 进行渐变,产生阴影效果。

二、背景图像与中间悬浮元素的效果

在网页中,常常需要将一些元素悬浮在背景图像上。利用 CSS Multi Background,我们可以很容易实现这种效果。

.container {
  background-image: url(images/background.png), url(images/middle.png);
  background-repeat: no-repeat, repeat-y;
  background-size: cover, auto;
}

以上代码实现了将来自两张不同背景图片的图像显示在同一页中,并且将其中一张图片垂直自适应平铺,另一张图片铺满整个容器。

三、圆形背景 + 边框 + 图像叠加效果

有时候,我们需要将一个圆形背景作为整个容器的背景。同时,还希望在圆形背景的上部添加详细解释文字或者其他的图像。这就需要CSS Multi Background为我们呈现一个圆形背景和多重叠加图像的效果。

.container {
  background-image: url(images/background-circle.png), url(images/background-overlay.png), url(images/more-info.png);
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-size: 100%, auto, 80px auto;
  background-position: center center, bottom center, center center;
  border-radius: 50%;
  border: 5px solid #fff;
  overflow: hidden;
}

通过以上代码,我们可以实现一个圆形容器的背景,并且将一个覆盖在圆形容器下面的图形,以及一个在圆形容器上覆盖显示的图片。

四、背景图像的透明度

有时候,我们需要将某个元素的背景图像做透明处理,同时再放置一个有颜色的蒙版上去。这时候就需要使用到CSS Multi Background 单个背景图像的透明度属性。

.container {
  background-image: url(images/background.png), url(images/mask.png);
  background-size: cover, contain;
  background-position: center center;
  background-repeat: no-repeat, no-repeat;
}

.container:before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(255,255,255,0.8);
}

以上代码实现了将一个半透明蒙版放置在容器背景图像上面。这里我们使用了 rgba 函数来表示背景颜色和 Alpha 透明度。这个例子中背景图片的透明度是通过 mask.png 的透明通道来实现的。这里我们设置了 background-size 属性,将 mask.png 的尺寸设为容器的大小,并将图片拉伸或缩放以适应容器大小。

五、多个背景图像叠加

以上例子均介绍如何利用 CSS Multi Background 实现单独使用的多个背景图像。但我们也可以将多张背景图片重叠在一起,从而实现更为复杂的效果。

.container {
  background-image: url(images/background-1.png), url(images/background-2.png), url(images/more-info.png);
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-size: cover, 60%, 80px auto;
  background-position: center center, center top, center bottom;
  border-radius: 25px;
  padding: 30px;
}

以上代码将多个背景图片进行叠加,不同层次的图像使用不同的排列方式和尺寸设置。可以看到,这种背景叠加的方式给网页带来了更加丰富、立体的视觉效果。

总结

以上是几个利用 CSS Multi Background 实现网页视觉效果的示例。在实际开发中,我们可以灵活运用这些技巧来丰富网页的视觉效果,提升用户的体验。

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when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${item.id} [in template "article/detail/index.ftl" at line 48, column 106] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... 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org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1431) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1167) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1106) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at com.software.filter.HttpSpiderIdentifyFilter.doFilter(HttpSpiderIdentifyFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) at java.base/java.lang.VirtualThread.run(VirtualThread.java:309)